<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr />
    <textarea placeholder="请输入要评论的内容" maxlength="120" v-model="msg"></textarea>
    <mt-button type="primary" size="large" @click="postcomment">发表评论</mt-button>
    <div class="cmt-list">
      <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
        <div
          class="cmt-title"
        >第{{i+1}}楼&nbsp;&nbsp; 用户:{{item.user_name}}&nbsp;&nbsp; 发布时间:{{item.add_time|dateFomat}}</div>
        <div class="cmt-body">{{item.content==="undifined"? '此用户很懒什么也没留下':item.content}}</div>
      </div>
    </div>
    <mt-button type="danger" size="large" plain @click="getmore">加载更多</mt-button>
  </div>
</template>


<script>
import { Toast } from "mint-ui";
export default {
  data() {
    return {
      pageIndex: 1,
      comments: [],
      msg: ""
    };
  },
  created() {
    this.getComments();
  },
  methods: {
    getComments() {
      this.$http
        .get(
          //下面的这个id 是props中的id 是通过父组件newsinfo 中 <comment-box> 中绑定的id传递过来的
          "http://www.liulongbin.top:3005/api/getcomments/" +
            this.id +
            "?pageindex=" +
            this.pageIndex
        )
        .then(result => {
          if (result.body.status == 0) {
            // this.comments = result.body.message; 这样做只会把新数据展现出来而把老数据覆盖
            this.comments = this.comments.concat(result.body.message);
          } else {
            Toast("评论获取失败");
          }
        });
    },
    getmore() {
      this.pageIndex++;
      this.getComments();
    },
    postcomment() {
      if (this.msg.trim() === "") {
        return Toast("评论内容不能为空");
      }
      this.$http
        .post(
          "http://www.liulongbin.top:3005/api/postcomment/" + this.$route.params.id,
          { content: this.msg.trim() }
        )
        .then(function(result) {
          if (result.body.status==0) {
            var cmt={user_name:'匿名用户',add_time:Date.now(),content:this.msg.trim()};
            this.comments.unshift(cmt);
            this.msg="";
          }
        });
    }
  },
  props: ["id"]
};
</script>
<style lang="less" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }

  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>